Re: 2 12 years old, became pretty lathargic 4-5 days and breathing thru mouth some
That looks safe and maybe just the tiniest bit long. Better a little longer and more often than too short. Rupert should be able to close her mouth all the way with a small bit of space left over. Location of the cut and a good, appropriate cutter are key. too short + bad/wrong cutter = bad cut = miserable, scared, p.o.'d Rupert. Douse the cutter in alcohol before the procedure.
"some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence